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A251785 as a simple table

n a(n)
1 1664
2 2640
3 6470
4 14908
5 35948
6 85826
7 210582
8 525800
9 1281188
10 3230514
11 8269042
12 20728732
13 53387162
14 139225802
15 357534236
16 936054498
17 2475510686
18 6476921720
19 17167048240
20 45854800004
21 121609864088
22 325220317710
23 874682014058

[1664,2640,6470,14908,35948,85826,210582,525800,
 1281188,3230514,8269042,20728732,53387162,
 139225802,357534236,936054498,2475510686,
 6476921720,17167048240,45854800004,121609864088,
 325220317710,874682014058]

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Last modified October 27 02:00 EDT 2021. Contains 348270 sequences. (Running on oeis4.)